feat: Add health endpoint

app/Http/Controllers/HealthController.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Item;
+use App\User;
+use Illuminate\Contracts\Container\BindingResolutionException;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Illuminate\Support\Facades\RateLimiter;
+
+class HealthController extends Controller
+{
+    /**
+     * @return int
+     */
+    private static function getUsers(): int
+    {
+        return User::count();
+    }
+
+    /**
+     * @return int
+     */
+    private static function getItems(): int
+    {
+        return Item::select('id')
+            ->where('deleted_at', null)
+            ->where('type', '0')
+            ->count();
+    }
+
+    /**
+     * Handle the incoming request.
+     *
+     * @param Request $request
+     * @return JsonResponse|Response
+     * @throws BindingResolutionException
+     */
+    public function __invoke(Request $request)
+    {
+        $REQUESTS_MAX_PER_MIN = 30;
+        $STATUS_TOO_MANY_REQUESTS = 429;
+
+        if (RateLimiter::remaining('health', $REQUESTS_MAX_PER_MIN) < 1) {
+            return response()->make('Too many attempts.', $STATUS_TOO_MANY_REQUESTS);
+        }
+
+        RateLimiter::hit('health');
+
+        return response()->json([
+            'status' => 'ok',
+            'items' => self::getItems(),
+            'users' => self::getUsers(),
+        ]);
+    }
+}

routes/web.php

@@ -2,6 +2,7 @@
 
 use App\Application;
 use App\Http\Controllers\Auth\LoginController;
+use App\Http\Controllers\HealthController;
 use App\Http\Controllers\HomeController;
 use App\Http\Controllers\ImportController;
 use App\Http\Controllers\ItemController;
@@ -111,3 +112,5 @@
 
 Route::resource('api/item', ItemRestController::class);
 Route::get('import', ImportController::class)->name('items.import');
+
+Route::get('/health', HealthController::class)->name('health');